What is the cost of fixing defects in software testing?

The cost of defects can be measured by the impact of the defects on the application and most importantly at which stage we find them. Earlier the defect is found lesser is the cost of fixing the defect.

For example if error is found in the requirement specifications then it is somewhat cheap to fix it. The correction to the requirement specification can be done and then it can be re-issued. In the same way when defect or error is found in the design phase then it is bit expensive to fix as compared to defect found in requirement specifications phase but still the design can be corrected and it can be re-issued. But if the error is not caught in the specifications and is not found till the user acceptance then the cost to fix those errors or defects will be way too expensive.

Below graph shows that cost of finding and fixing defects increases over time.

cost of fixing defects in software testing istqb

Same principle applies for construction phase. If however, a defect is introduced in the requirement specification and it is not detected until acceptance testing or even once the system has been implemented then it will be much more expensive to fix. This is because rework will be needed in the specification and design before changes can be made in construction; because one defect in the requirements may well propagate into several places in the design and code; and because all the testing work done-to that point will need to be repeated in order to reach the confidence level in the software that we require.

It is quite often the case that defects detected at a very late stage, depending on how serious they are, are not corrected because the cost of doing so is too expensive.

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